From: Liping Zhang <liping.zhang@xxxxxxxxxxxxxx>
For example:
# iptables-translate -A OUTPUT -m statistic --mode nth --every 10 \
--packet 1
nft add rule ip filter OUTPUT numgen inc mod 10 1 counter
# iptables-translate -A OUTPUT -m statistic --mode nth ! --every 10 \
--packet 5
nft add rule ip filter OUTPUT numgen inc mod 10 != 5 counter
Note, mode random is not completely supported in nft, so:
# iptables-translate -A OUTPUT -m statistic --mode random \
--probability 0.1
nft # -A OUTPUT -m statistic --mode random --probability 0.1
Signed-off-by: Liping Zhang <liping.zhang@xxxxxxxxxxxxxx>
---
extensions/libxt_statistic.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/extensions/libxt_statistic.c b/extensions/libxt_statistic.c
index b6ae5f5..4f3341a 100644
--- a/extensions/libxt_statistic.c
+++ b/extensions/libxt_statistic.c
@@ -133,6 +133,26 @@ static void statistic_save(const void *ip, const struct xt_entry_match *match)
print_match(info, "--");
}
+static int statistic_xlate(struct xt_xlate *xl,
+ const struct xt_xlate_mt_params *params)
+{
+ const struct xt_statistic_info *info =
+ (struct xt_statistic_info *)params->match->data;
+
+ switch (info->mode) {
+ case XT_STATISTIC_MODE_RANDOM:
+ return 0;
+ case XT_STATISTIC_MODE_NTH:
+ xt_xlate_add(xl, "numgen inc mod %u %s%u",
+ info->u.nth.every + 1,
+ info->flags & XT_STATISTIC_INVERT ? "!= " : "",
+ info->u.nth.packet);
+ break;
+ }
+
+ return 1;
+}
+
static struct xtables_match statistic_match = {
.family = NFPROTO_UNSPEC,
.name = "statistic",
@@ -145,6 +165,7 @@ static struct xtables_match statistic_match = {
.print = statistic_print,
.save = statistic_save,
.x6_options = statistic_opts,
+ .xlate = statistic_xlate,
};
void _init(void)
--
2.5.5
--
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